Reciprocal differences and combining ability for growth and yield components in cacao (Theobroma cacao L.): a case of recommended cacao varieties in Ghana

Ofori, Atta; Padi, Francis Kwame

doi:10.1007/s10681-020-02729-0

Cited by 10 publications

(6 citation statements)

References 35 publications

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“…The mean numbers of beans per pod are rather low, ranging between 24.4 and 34.5 and are the main reason for the low mean cocoa weight per pod. 34.5 is much lower than the highest values observed by Ofori and Padi [17] in Ghana (42 beans) and by Maharaj et al [23] in Trinidad (52.2 beans).…”

Section: Resultsmentioning

confidence: 56%

Evaluation of Cocoa Full-Sib Progenies in Challenging Conditions in Cameroon

Sounigo,

Vefonge,

Eyango

et al. 2023

JEAI

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The improved vegetal material cultivated by cocoa farmers in Cameroon consists in full-sib progenies issued from pods harvested in bi-clonal seed gardens set up during the 1970s. Interviews of cocoa farmers revealed their general satisfaction with the yield level obtained from these progenies but also their disappointment with the high level of susceptibility to black pod disease, a disease caused by Phytophthora megakarya, which is a serious challenge for cocoa production in this country. In order to select new future varieties that would combine high yield and resistance to black pod disease, new progeny trial plots were set up from 2005, in research stations and on farm. 23 cocoa full-sib progenies were assessed and compared to 3 control progenies. in a trial plot set up in 2005 in a research station located in the south western region of Cameroon. The cocoa trees were assessed during eight consecutive years of cocoa production. A large level of variation was observed among the progenies for mortality rate (ranging between 6 and 52%), annual potential yield (ranging between 151 and 1,808 kg/ha), annual actual yield (ranging between 114 and 1,159 kg/ha) and black pod disease incidence (ranging between 19 and 39,8%) caused by Phytophthora megakarya. Nine of the assessed full-sib progenies were identified as promising and the authors suggest how to confirm their performances before their release to farmers.

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Section: Resultsmentioning

confidence: 56%

Evaluation of Cocoa Full-Sib Progenies in Challenging Conditions in Cameroon

Sounigo,

Vefonge,

Eyango

et al. 2023

JEAI

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“…The significant difference observed between the levels of yield of progenies issued from reciprocal crosses (IMC 67 × SNK 109/SNK 109 × IMC 67 and T 79/501 × SNK 109/SNK 109 × T 79/501) confirm the existence of reciprocal effects for this trait, showed by Despréaux et al (1989) [20] in a diallel trial experiment conducted in Cameroon, and in a diallel trial experiment conducted in Ghana, by and Ofori and Padi (2020) [21]. Although our assessment, based on seven consecutive years of production, can be considered as reliable enough to make recommendation about the release of the progenies to farmers, it would be interesting to continue the assessment of the progenies in the same trial plots during a longer period, in order to estimate their longevity and their yield stability over time (Tahi et al, 2019) [22].…”

Section: Discussionmentioning

confidence: 59%

Evaluation of Adaptation and Yield Stability of Cocoa Progenies in Marginal Conditions: Results from an on Farm Cocoa Trial Set up in a Forest–Savannah Transition Area in Cameroon

Tchoua

Sounigo²,

Bourgoing

et al. 2021

Crops

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Cocoa is an important crop in Cameroon, where it is cultivated in different areas, including marginal areas, characterized by a rather low level of annual rainfall and marked dry seasons. In order to release cocoa varieties with a good level of adaptation to these marginal conditions, nine full-sib progenies, already released to farmers in other producing areas of the country, were assessed on twelve on farm cocoa plots, set up in 2006, in Mbam et Inoubou county, which is a forest–savannah transition zone. The traits assessed were mortality rate, yield and yield stability. Mortality rate and yield vary widely among trial plots and among progenies. Four out of the nine assessed progenies present a yield level significantly higher than the five others. The lowest level of yield stability (estimated by the contribution to total ecovalence) was observed in both the highest and the lowest yielding progenies. Recommendation for the large-scale release of these progenies to farmers of the county, and to other cocoa producing forest–savannah transition areas, are made, based on the results obtained from this study.

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“…This conforms to the findings of Vallecer et al (2018), as they also found that BR 25 significantly responds to different applications of fertilizer in terms of stem girth. Ofori and Padi (2020) also reported that the BR 25 variety of cacao is more significantly responsive to any fertilizers in any growth performance compared to other varieties.…”

Section: Resultsmentioning

confidence: 94%

Growth Response of Cacao (Theobroma cacao L.) Varieties to Different Soil Amendments Combined With Inorganic Fertilizers

Binas,

Bucan

2022

J. Current Opinion Crop Sci.,

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Cacao is essential because of its high domestic and foreign demand. Nutrient supply to cacao varieties is required to enhance their growth. Thus, this study was conducted to assess the growth response of four NSIC-approved cacao (Theobroma cacao L.) varieties: ICSS 40, UF 18, BR 25, and K 2 to chicken dung and vermicompost combined with inorganic fertilizer. An area of 1,620 m2 was laid out in a 4 x 3 factorial experiment adopting the Randomized Complete Block Design (RCBD) with three (3) replications. The existing Cacao plants were used in the experiment. Cacao varieties (V1 - ICS 40, V2 - UF 18, V3 - BR 25, and V4 - K 2) were designated as factor A, while soil amendments (A0 – inorganic fertilizer alone, A1 - chicken dung + complete fertilizer, and A2 – vermicompost + complete fertilizer) were as factor B. The application of both chicken and vermicompost + complete fertilizers gave a significantly tall, number of leaves and branches of cacao varieties than the application of inorganic fertilizers alone. The BR 25 variety applied with chicken dung + inorganic fertilizer (T8) had significantly performed in terms of stem girth 90 days after the application of treatments. The BR 25 + chicken dung + complete fertilizer (T8) and ICS 40 applied with chicken dung + complete fertilizers (T2) treatment combinations are the best for growth.

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Reciprocal differences and combining ability for growth and yield components in cacao (Theobroma cacao L.): a case of recommended cacao varieties in Ghana

Cited by 10 publications

References 35 publications

Evaluation of Cocoa Full-Sib Progenies in Challenging Conditions in Cameroon

Evaluation of Cocoa Full-Sib Progenies in Challenging Conditions in Cameroon

Evaluation of Adaptation and Yield Stability of Cocoa Progenies in Marginal Conditions: Results from an on Farm Cocoa Trial Set up in a Forest–Savannah Transition Area in Cameroon

Growth Response of Cacao (Theobroma cacao L.) Varieties to Different Soil Amendments Combined With Inorganic Fertilizers

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